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So all you have to do then is remove the .sis part of the theme name and install it? :)

Is there a memory issue, ie how much you have remaining? and have you tried uninstalling a theme and re-installing to see if this happens.

I will try and read through some Nokia blogs and see if...

First thing to do is;

Menu>Tools>Application Manager
then press <options> button, select <settings> ,
enable all software installation and disable online certif. check.

If that does not fix...

You Dont, you only need to know that if you get the error message when installing onto your Mobile then changing the date can rectify the problem.;)